From the Super Mario Wiki
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There are very many platforms for Mario to jump on to reach Donkey Kong. On the bottom there are two platforms on each side Mario can jump on easily to get up to the middle platform which leads to four more platforms on both sides for Mario to jump on which leads to even more platforms on each sides with a platform in the middle. There are four more platforms on both sides higher than the middle platform then there's Donkey Kong on a platform in the middle with Pauline on a platform above him.